table {
    border-collapse: collapse;
}

table tr th, table tr td {
    border: 1px solid #666666;
    padding: 5px;
}

li {
    float: left;
    list-style-type: none;
    border: 1px solid #ddd;
    width: 40px;
    height: 40px;
    text-align: center;
    line-height: 40px;
}

.active {
    background: #4CAF50;
    color: white;
}

li:hover {
    cursor: pointer;
}

li:hover:not(.active) {
    background: #ddd;
}
hr {
    margin: 60px 0;
}